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Effects of Mining on the Fitzroy River Basin

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Effects of Mining on the Fitzroy River Basin A study of the cumulative impacts on water quality of mining activities in the Fitzroy River Basin April 2009 Acknowledgements: The Department of Environment and Resource Management (DERM) would like to thank staff from the former Departments of Natural Resources and Water, and Mines and Energy who supplied data for this report. DERM would also like to thank the operators of all coal mines within the Fitzroy Basin who kindly provided the information which formed the basis of this report. (c) The State of Queensland (Department of Environment and Resource Management) 2008 Disclaimer: While this document has been prepared with care it contains general information and does not profess to offer legal, professional or commercial advice. The Queensland Government accepts no liability for any external decisions or actions taken on the basis of this document. Persons external to the Department of Environment and Resource Management should satisfy themselves independently and by consulting their own professional advisors before embarking on any proposed course of action. Maps Source: Department of Environment and Resource Management data sets. Cadastral Information supplied by NR&W. SDRN road data ©MapInfo Australia Pty Ltd 2008 ©Public Sector Mapping Authority Australia Pty Ltd 2008. Projections Geographic Datum GDA94. 2 ACCURACY STATEMENT Due to varying sources of data, spatial locations may not coincide when overlaid DISCLAIMER Maps are compiled from information supplied to the Department of Environment and Resource Management. While all care is taken in the preparation of these maps, neither the Department nor its officers or staff accept any responsibility for any loss or damage which may result from inaccuracy or omission in the maps from the use of the information contained therein. 3 Executive Summary This study examines available data to report on the implications of water discharges from mines on water quality in the Fitzroy River Basin. This study was initiated in response to concerns about water quality following the discharge of very large quantities of water from mines in the Fitzroy River Basin from February to September 2008. The terms of reference for this study (Appendix A) detailed key elements to be covered with the overall purpose being to make recommendations for the management of water discharges from mining activities with respect to water quality. The study focuses on discharges from coal mining operations as the Fitzroy River Basin’s large-scale mining activities are dominated by coal mining and planned coal mine expansions. These operations potentially release far greater volumes of water than any other mining source currently operating. They have also operated for long periods of time giving the best opportunity to examine changes in regulation and management of water quality over time. The major water quality parameters of concern associated with coal mining are salinity (based on electrical conductivity), heavy metal ion concentrations and acidity/alkalinity. The study has focussed on salinity impacts as these were of major concern to the communities in the areas affected by the mine discharges in 2008 and the available data relates more to salinity than any other contaminant. The major findings of this study concluded that in the Fitzroy Basin: • discharge quality limits and operating requirements for coal mine water discharges are inconsistent; • the discharge quality limits and operating conditions for some coal mines do not adequately protect the downstream values of the environment; • background data relating to the quality of the waterways receiving discharge water is extremely limited; • there is insufficient data to quantify the cumulative impacts of mining water discharges; • additional and ongoing monitoring and analysis is needed to develop a modelling program for assessing cumulative impacts; and • based on a risk assessment using salinity, six mines were identified as being the highest contributors to potential cumulative impacts (Coppabella, North Goonyella, Goonyella Riverside, Millennium, Peak Downs and Ensham). The findings for each of the key elements of the study as listed in the terms of reference are provided in detail in the relevant chapters of this study and summarised below. Regulatory framework for managing the quality of water discharges The regulation of water discharges from mines has undergone considerable change in relation to the applicable legislation and responsible Government Agency. Since 2001, the former Environmental Protection Agency (EPA), now the Department of Environment and Resource Management (DERM), has regulated water discharges from mines under conditions listed in each mine’s environmental authority. When the EPA took control of mining environmental regulation, it generally converted the commitments from the environmental management overview strategies accepted by the former Department of Mines and Energy (DME) to conditions in new environmental authorities. Generally only new or recently amended environmental authorities contain new conditioning arrangements relating to monitoring parameters and toxicity trigger values. Some environmental authorities have not had conditions changed since they were issued so do not necessarily reflect current knowledge nor best management practice. Under the current provisions in the Environmental Protection Act 1994 (EP Act), environmental authorities may only be amended without agreement of the holder under limited triggers. 4 Existing approaches to minimising water quality impacts Water quality impacts are generally managed under conditions set out in environmental authorities. These authorities place limits on water quality indicators such as pH, electrical conductivity or total dissolved solids and total suspended solids. However, the limits set are based on limited knowledge of ambient water quality conditions, are developed on a case by case basis and are subject to intensive negotiations with the mining companies. As a result, the conditions set in environmental authorities do not always reflect best practice for water quality management nor consider the potential cumulative impacts of several mines in the one catchment. Analysis of currently authorised water discharges All of the mines in the Fitzroy River Basin except two are permitted to discharge water under varying conditions set out in environmental authorities under the EP Act. The environmental authorities include anywhere from one to 15 approved discharge locations and may list multiple receiving waters, each with different release conditions. A key reason for this variation is the scale of some sites, the ephemeral nature of streams in the region and the difficulty in determining ambient water quality. Forecast of future mining activities At the time of writing this report there were about 45 coal mines, 10 significant mineral mines (excluding small mining operations and gemstone mines) and 20 medium to large quarries operating in the Central Queensland region, although not all are in the Fitzroy River Basin. Many of these mines have ore reserves that will enable production beyond 2020. The current global financial situation may impact on new or expansion projects, however, the environmental issues associated with future activities remain a key issue. Review of water quality data All of the currently operating coal mines (38) in the Fitzroy River Basin provided data for this study. This data highlighted the different conditions in place across mines and the limited data available in the region. Mine environment monitoring was generally limited to mine tenure and to times when discharges were occurring. There is a general lack of ambient water data. Analysis of trends in water quality and an assessment of impacts Previous studies into water quality suggest that the Fitzroy River Basin is a naturally moderate but variable saline system with substantial differences in electrical conductivity levels across sub-catchments. These studies give a broad picture of baseline information for ambient ranges of electrical conductivity (which is a typically a reliable surrogate for salinity) but not for other contaminants. Water quality monitoring, data collection and reporting in the region is undertaken by a diverse range of State and local government agencies, water providers, natural resource management groups, mines and other industries. There is no single entity that collates, manages and analyses water quality data for the catchment. Analysis of risks associated with changes in water quality and potential cumulative impacts In the Fitzroy River Basin, the greatest risk to water quality from coal mines is increased salinity levels resulting from occasions when mine water is discharged. Drinking water and aquatic ecosystems are the most sensitive downstream values to be protected from mine discharge waters. The impacts on these ecosystems are not well known because there is insufficient baseline biological and ecological information and no long-term biological monitoring to identify ecological changes over time. Increased salinity will also affect the taste of drinking water and very high levels may affect crops if water is used for irrigation. The potential for accumulation of salinity in ephemeral streams is high as stream inputs can only be removed by natural flows from rainfall events flushing accumulated salinity from waterholes and the numerous water impoundments along the river system. This study has examined the catchments most at risk of cumulative
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